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(a) Figure 8 shows ultra-violet light striking a polished zinc plate placed on a negatively charged gold-leaf electroscope.
Explain the following observations:
(i) The leaf of the electroscope falls.
(ii) When the same experiment was repeated with positively charged
electroscope, the leaf did not fall.
(b) State two factors which determine the speed of photoelectrons emitted by a metal surface.